bhyve: zvols for guest disk - yes or no?

[Patrick M. Hausen]

Hi, all,

> Am 16.11.2016 um 18:17 schrieb Jan Bramkamp <crest at rlwinm.de>:
>> http://jrs-s.net/2016/06/16/psa-snapshots-are-better-than-zvols
> 
> Afaik this is only a problem if you create a reservation for your ZVOLs. By default ZFS does create ZVOLs with reservations matching their size.

Ah ... of course.

As for the rest of your kind explanation - I'm well aware of that.
If you over-provision, you have to take responsibility and at least
monitor usage closely (Observium, Munin, ...)
Thanks, Jan!

> ZFS saved my bacon more than once. Twice it detected and corrected datacorruption on dying hardware in time. With a normal FS both cases would have turned into bitrot spreading into the backups until it's too late.

Same here. F2or that dedicated hypervisor server I just thought
for a moment I could save some memory.

> Without ZFS you would require a reliable hardware RAID controller (if such a magical creature exists) instead (or build a software RAID1+0 from gmirror and gstripe). IMO money is better invested into more RAM keeping ZFS and the admin happy.

And we always use geom_mirror with UFS ...

Thanks again, will go the ZFS route, set up the system with the
16 GB RAM it has, then upgrade to 32 in a week or two.

The plan is to put around 10 VMs with 2-4 G of configured
memory on that system.

bhyve doesn't do page deduplication like ESXi does, yet - right?

Kind regards,
Patrick
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